Valve mechanism for internal-combustion engines



g H. FORD VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES Filed April 22, 1926 INVENTOR '45 bottom upwardly an are held by Patented Aug. 23, 1927.

' UNITED STATES PATENT OFFICE.

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VALVE I03 INTERNAL-COMBUSTION EKGINES.

'Appllcation fled April 82, 1W6. Serial No. 103,856.

Fig. 1, is a section of an internal com li bustion engine, of a type now in general.

use, showing in elevation my'i'nventlon applied thereto. U Fig. 2, is aperspective view of my spht bushing or hearing for the upper portion of the valve-stem.-

- Fig. 3, is a perspective view of my valvestem. v

Fig. 4, is a perspective view of th cap which is adapted to lit the lower end 0 the valve-stem and form a asupport for the spring Fig; 5, is a plan view of the bottom of Fig. 4.

n the accompanyin numerals are employexf to indicate the several parts. 1 is a section of an engine block of a type now in common use-and its construction-is well understood. 2 is my valvestem which is provided with a flare 3 at the bottom and a valve on the opposite end thereof. This stem, is secured the en ine block by means of a splitbushing 4 w ich enables me to insert the bushing after the valve-stem is in place. I On the lower end t0 of this bushing is a flange 5 which forms an abutment for the upper end of the spr'tueig 6. After the-valve-stem has been inser in the aperture in the engine block the parts of the split bushin are forced from the frictional engagement with the walls of the u per side of the engine block. A cap 7 is a apted to fit the lower end 3 of the valve-stem 2 and is provided with a flange 8 which forms a support for the lower end of the spring 6. v The cap 7 has acone-sha ed bore as shown in Fig. 4, and is adapte' to fit the flared end 3 of the stem 2. A segment 9 of the ca 7 is cut out as shown in 5 to a widt slightly greater than the ameter of the drawings reference.

stem 2 so that it may be passed over the stem' and dropped down until it fitsover the flared end of-the stem, in which position it may not be removed laterally, hence it forms a secure footing to support the lower end of the spring 6. The cap 7 may be made in different sizes, particularly in respect to the thickness of the flange 8 and by removing this cap one provided with a thicker flange may be inserted which will result in decreasing the distance between the spring supports and increase the normal tension of the H spring. It is Well known that when such springs become weak it is usually necessary to provide a new spring, whereas with my construction the insertion of a new cap pro vided with a thicker flange is all that is necessary'for a considerable period, and this may beaccomplished without the difiiculty incident to removing the spring.

A push-rod'or tappet 10 is operated by a cam'11,'the construction and operation of which is well understood and hence need not be described. In internal combustion engines as heretofore constructed the valvestem is of less diameter than the head of the tappet and under the severe use to which they are, subjected the contacting parts wear away, and sometimes irregularly, but with my construction the lower end of the valvestem has a diameter equal to that of the upper end of the tappet, hence there will be less wear and besides wear will be substantially e ual at all oints.

It wi be rea il understood from the foregoing constructlon that the valve-stem may be easily removed by first compressing the spring by lifting upwardly thereupon,

then removing the cap, then lifting thev valve-stem and removing the spring, then driving out the split bushing which incloses the upper portion of the valve-stem.

Having fully described my invention and its mode of operation, what I claim is:

1. In a valve mechanism for internal combustion engines, the combination of-an engine block with a valve-stem provided with a valve on one end thereof and havin its opposite end flared, a split bushing in w ichthevalve-stem is adapted to-be reciprocated a member adapted to fit the flared end 0 the valve stem and having a segment slightly wider than the least diameter of the valve-stem cut awa and-a resilient member supported by said t named member.

2. A valve mechanism for internal comwherein the split bushing is provided with bustion engines as in claim 1 described, a flange adapted to afl'ord an abutment for wherein the member ada ted to fit the flared one end of the resilient member. 1 10 end of the valve-stem 1s provided with a Signed at the cit of Detroit, county of 5 flange to support the resilient member. Wayne, State of Michigan, this 15 day of 3. A valve mechanism for internal com- April, 1926.

bustion engimes as in claim 1 described, HENRY FORD. 

